Quarter	Percent
1999-04-01	63
2000-01-01	58.7
2000-04-01	63.8
2000-07-01	66.5
2000-10-01	60.7
2001-01-01	56.8
2001-04-01	64.7
2001-07-01	65.3
2001-10-01	62.2
2002-01-01	61.5
2002-04-01	66
2002-07-01	67.1
2002-10-01	62.3
2003-01-01	59.3
2003-04-01	63.2
2003-07-01	65
2003-10-01	61.4
2004-01-01	58.8
2004-04-01	64.4
2004-07-01	65.2
2004-10-01	60.1
2005-01-01	56
2005-04-01	61.6
2005-07-01	63.5
2005-10-01	59.5
2006-01-01	55.3
2006-04-01	59.4
2006-07-01	61.6
2006-10-01	55.6
2007-01-01	56.5
2007-04-01	60.2
2007-07-01	62.7
2007-10-01	61
2008-01-01	62.8
2008-04-01	64
2008-07-01	63.1
2008-10-01	59.1
2009-01-01	59.5
2009-04-01	60.6
2009-07-01	59.9
2009-10-01	55.8
2010-01-01	56
2010-04-01	58.7
2010-07-01	57
2010-10-01	55.7
2011-01-01	55.6
2011-04-01	56.8
2011-07-01	58.4
2011-10-01	55.7
2012-01-01	55.2
2012-04-01	58.2
2012-07-01	60.2
2012-10-01	57.7
2013-01-01	59.4
2013-04-01	58.9
2013-07-01	58.3
2013-10-01	56.3
2014-01-01	54.4
2014-04-01	56
2014-07-01	57.1
2014-10-01	55.7
2015-01-01	54.8
2015-04-01	59.6
2015-07-01	58.3
2015-10-01	53.8
2016-01-01	55.1
2016-04-01	55.2
2016-07-01	57.5
2016-10-01	52.9
2017-01-01	51.5
2017-04-01	55.1
2017-07-01	55.9
2017-10-01	53.3
2018-01-01	52.1
2018-04-01	55.5